Sancho III (c. 1134 – 31 August 1158), called the Desired (el Deseado),[a] was King of Castile and Toledo for one year, from 1157 to 1158. He was the son of Alfonso VII of León and Castile and his wife Berengaria of Barcelona, and was succeeded by his son Alfonso VIII. His nickname was due to his position as the first child of his parents, born after eight years of childless marriage.
Sancho was the eldest son of King Alfonso VII of León and Castile and Berengaria of Barcelona.[1] He was endowed with the "Kingdom of Nájera" in 1152, and, according to Carolina Carl, never appears in documents as "king of Nájera".[2] He also succeeded Urraca the Asturian in ruling the Kingdom of Artajona [eu].[3] His father's will partitioned the kingdom between his two sons: Sancho inherited the kingdoms of Castile and Toledo, and Ferdinand inherited León.[4] The two brothers had just signed a treaty when Sancho suddenly died in the summer of 1158, being buried at Toledo.[5]
During his reign, the castle of Calatrava-la-Vieja was conceded to Abbot Raymond Serrat of Fitero, who proposed using the lay brothers of his monastery as knights to defend this castle. These knights would give rise to the Order of Calatrava, which was confirmed in 1164 by Pope Alexander III.[6][7]
The Treaty of Sahagún of May 1158, outlined the spheres of conquests between Leonese and Castilian against al-Andalus. A possible division of the Portuguese kingdom among the two sons of Alfonso VII, would come to nothing due to the premature death of Sancho.[8][9]
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